Direct chill casting mold

ABSTRACT

The mold has means therein defining a fluid coolant chamber around the inner peripheral wall thereof, and an aperture in the body thereof, about one end opening thereof, adjacent the inner peripheral wall of the mold. There are also means in the mold for supplying fluid coolant to the aperture, for discharge into the inner peripheral plane of the mold, including a fluid coolant inlet which is connected to the aperture separately and independently of the chamber.

United States Patent 1 Wagstaff et al.

[111 3,739,837 June 19, 1973 DIRECT CHILL CASTING MOLD [75] Inventors:Frank E. Wagstaff, Spokane; Wiliam G. Wagstaff, Veradale; Paul H. May,Spokane, all of Wash.

[73] Assignee: Wagstaff Machine Works, Inc.,

Spokane, Wash.

22 Filed: June 18, 1971 21 Appl.No.:154,567

52 user. ..l64/283, 164/89 51 1m. (:1 ..B22d 11/12 58 Field of Search164/283, 89; 249/79 [5 6] References Cited UNITED STATES PATENTS3,286,309 11/1966 Brondyke et al. 164/283 X FOREIGN PATENTS ORAPPLICATIONS 813,755 9/1951 Germany 164/283 932,085 8/1955 Germany164/283 Primary Examiner-Robert D. Baldwin Attorney-Christensen &Sanborn [57] ABSTRACT The mold has means therein defining a fluidcoolant chamber around the inner peripheral wall thereof, and anaperture in the body thereof, about one end opening thereof, adjacentthe inner peripheral wall of the mold. There are also means in the moldfor supplying fluid coolant to the aperture, for discharge into theinner peripheral plane of the mold, including a fluid coolant inletwhich is connected to the aperture separately and independently of thechamber.

17 Claims, 10 Drawing Figures FIELD OF THE INVENTION This inventionrelates to the direct chill casting of metal ingots, and in particularto a mold and/or apparatus for use in this connection.

BACKGROUND OF THE INVENTION INCLUDING CERTAIN OBJECTS THEREOF In thedirect chill casting of metal-ingots, the molten metal is continuouslyor continually charged into a sleeve-like, open-ended casting mold whichis continuously chilled and cooperatively arranged over a male platen toreduce each charge to a form sustaining condition, as the platen iscontinuously or continually withdrawn from the mold in the axialdirection thereof, to progressively accumulate the charges in anelongated ingot of the metal which may be severed from time to time asthe operation proceeds. The mold is chilled by either circulating afluid coolant therethrough, or by subjecting the mold to a spray of thesame. Conventionally, the ingot itself is also chilled as it emergesfrom the mold. The additional cooling effect is added to variousdegrees, depending on the properties desired in the body of the metal.It is achieved by discharging the mold coolant flow onto the ingot froma slot about the underside of the mold, together possibly with sprayingthe ingot from heads located under the mold.

Heretofore, then, the effect of the additional cooling process has beendependent on the temperature and rate of coolant flow to the molditself, since the latter flow is ordinarily added to the ingot coolantflow in all cases. One object of the present invention is to provide adirect chill casting mold and/or apparatus wherein the temperature, rateand other parameters set for the coolant flow to the ingot, arecontrollable separately and independently of the coolant flow to themold itself, either by bypassing the whole of the ingot coolant flowaround the mold coolant-stage, or by bypassing a portion of the sametherearound. Another object is to provide a mold and/or apparatus ofthis nature wherein at least a portion of the ingot coolant flow is madeup of a fresh fluid coolant medium which has not been preheated by themold coolant stage. A further object is to provide a mold and/orapparatus of this nature wherein the mold coolant stage and the ingotcoolant stage are segregated from one another, so that the effect ineach stage can be regulated without regard to the other stage, even tothe extent of achieving a zero condition in either stage if desired. Astill further object is to provide a mold and/or apparatus of thisnature wherein though segregated, both the mold coolant flow and theingot coolant flow are channelled through the body of the mold to theirrespective stages; as for example, where the mold coolant flow iscirculated to the inner peripheral wall of the mold, whereas the ingotcoolant flow is a separate flow which is put through the underside ofthe mold and discharged onto the ingot from an aperture around the lowerend opening thereof. Other objects include the provision of a moldand/or apparatus of this nature wherein the task of cleaning andotherwise maintaining the mold is greatly facilitated by embodying thoseoperative elements of the mold which ordinarily require cleaning andclose monitoring, in a subassembly that is easily stripped from the moldand cleaned as a separate integral unit. Still further objects willbecome apparent from the description of the invention which followshereafter.

SUMMARY OF THE INVENTION These objects and advantages are realized by adirect chill casting mold of our invention which has means thereindefining a fluid coolant chamber around the inner peripheral wall of themold, and an aperture in the body thereof, about one end openingthereof, adjacent the inner peripheral wall of the mold; together withmeans for supplying fluid coolant to the aperture for discharge into theinner peripheral plane of the mold, including a fluid coolant inletwhich is connected to the aperture separately and independently of thechamber. The mold may also have passage means in the body thereof,connecting the chamber to the aperture to discharge the coolant in thechamber therethrough. Or alternatively, the body of the mold may beequipped with passage means connecting the chamber to an outlet which isseparate and indepen dend of the aperture, to discharge the coolant inthe chamber through it instead.

For example, where the chamber coolant is also discharged through theaperture, the inner periphery of the chamber may be defined by the innerperipheral wall portion of the mold, and the aforesaid passage means inthe body of the mold may include a series of passages extending withinthis wall portion between the chamber and the aperture.

In a presently preferred embodiment of the invention which embodies thisfeature, the aforesaid fluid coolant inlet is interconnected with theaperture through a second chamber which is disposed adjacent the one endof the mold and defined in part by that section of the inner peripheralwall portion of the mold adjacent the one end thereof. The aperturetakes the form of a slot of nozzled cross section in the one end of themold, and in addition to the aforementioned passages, there are otherpassages interconnected between the second chamber and the slot, in theone end wall portion of the mold, to discharge the coolant in the secondchamber across the path of the coolant issuing from the firstmentionedpassages.

In this embodiment, moreover, the mold has a cavity in the one endthereof, and the first and second mentioned chambers are formed in thecavity by a removable cover which is disposed on the one end of themold, across the opening of the cavity, and equipped with partitioningthat inserts in the cavity to form a cellular infrastructure therein.The second mentioned passages between the second chamber and the slotare defined by mutually opposing surfaces of the cover and the innerperipheral wall portion of the cavity.

Preferably, each chamber has baffling therein to uni formly distributethe coolant in the same before it dis-- charges through the respectivepassages. I

On the other hand, where the coolant of the first mentioned chamberdischarges to an outlet separate and independent of the aperture,preferably the inlet for the coolant flow to the aperture isinterconnected with the same through a second chamber which is separatedfrom the inner peripheral wall portion of the mold by the firstmentioned chamber. The first mentioned chamber is defined in part by theone end wall portion of the mold, and the second mentioned chamber isinterconnected with the aperture by a series of passages extendingwithin the one end wall portion of the mold.

The passage means to the outlet for the first mentioned chamber, includea system of box partitioning which is interposed between the first andsecond chambers, and operative to form a pair of tubular jacketstherebetween which communicate with the first mentioned chamber, tosupply and withdraw fluid coolant therefrom. The passage means alsoinclude a plurality of nipples which are interconnected with the jacketsto supply and return the coolant through the one end wall portion of themold.

In a second embodiment of the invention, the mold again has a cavity inthe one end thereof, the opening of which in this case is closed by aremovable cover that is equipped with the partitioning and nipples, toform the necessary cellular infrastructure therein, including thejackets. The cover also has a bulkhead raised thereon, about the innerperipheral edge thereof, and the passages to the aperture from thesecond mentioned chamber are disposed in the bulkhead, again tocommunicate with a slot of nozzled cross section in the one end of themold.

BRIEF DESCRIPTION OF THE DRAWINGS These features will be betterunderstood by reference to the accompanying drawings which illustrateeach of the aforementioned embodiments.

In the drawings,

FIG. 1 is a perspective view of the first mentioned embodiment whichoperates to blend the mold coolant with the ingot coolant, and viseversa;

FIG. 2 is a cross sectional view of the mold line 2-2 of FIG. 1;

FIG. 3 is an elevational view of the mold line 3-3 of FIG. 2;

FIG. 4 is a cross sectional view of the mold along the line 4-4 of FIG.2;

FIG. 5 is a cross sectional view of the mold along the line 5-5 of FIG.2;

FIG. 6 is a cross sectional view of the mold line 6-6 of FIG. 2;

FIG. 7 is a cross sectional view of the mold along the line 7-7 of FIG.2;

FIG. 8 is a cross sectional view of the mold along the line 8-8 of FIG.2;

FIG. 9 is a part perspective cut-out view of the second embodiment whichmaintains a dual flow; and

FIG. 10 is an enlarged lower end cross section of the mold seenin FIG.9.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring first to the blenderversion of FIGS. 1-8, it will be seen that the mold 2 has an open-endedrectangular body configuration in either plan view, and a low, flat,shallow profile from all sides, which profile is accentuated by a thickperipheral flange 4 around the outer peripheral upper edge thereof. Theinner peripheral wall 6 of the mold is convex and prolate inconfiguration, to correspond to the elongated rectangular character ofthe mold, and has rounded corners 6' at the points where it changesdirection in the mold. In vertical cross section, the mold has a hollowinfrastructure which is largely concealed behind a flat annularly shapedplate 8 that is fastened to the underside of the mold to cover andsubstantually close a deeply recessed along the along the along thecavity 10 therein. The cavity 10 extends about the entire perimeter ofthe mold, so that the main body of the mold has an overturned U-shapedcross section, the inner peripheral wall portion 12 of which isconsiderably thicker than the outer peripheral wall portion 14 thereof.Moreover, the cavity 10 is countersunk to a considerable depth, so thatthe wall portions have shoulders 16 thereabout which are coplanar withone another to provide a seat for an annular plate 18 that is tightlyscrew-clamped to the mold in the cavity, on the shoulders, to divide thecavity into relatively upper and lower chambers 29 and 22, respectively,that likewise extend about the entire perimeter of the mold. Eachchamber is serviced with fluid through a tapped hole 24 or 26 in theouter peripheral wall portion 14 of the mold at one end thereof. Eachchamber is also subdivided by a baffle 28 or 30 which operates touniformly distribute the fluid contained therein before the fluid isdischarged into the inner peripheral plane 32 of the mold, along theunderside of the mold, as shall be explained.

Referring to FIG. 2 in particular, it will be seen that the innerperipheral wall portion 12 of the mold has a depending lip 34 thereonwhose inner peripheral surface coincides with the inner peripheral plane32 of the mold, and the outer peripheral surface 36 of which taperstoward the plane 32 in the downward direction. The lip 34 is relativelyradially opposed to, but spaced from the inner peripheral edge 38 of thecover plate 8, and like the lip 34, the edge 38 is mitered so that theslot 40 formed therebetween has a nozzled cross section which is angledon a line of discharge toward the inner peripheral plane 32 of the mold.The slot 40 communicates with the chambers 20 and 22 through two seriesof passages 42 and 44 which radiate thereabout, in the directions of therespective chambers. The passages between the slot 40 and the upperchamber 20 take the form of a system of holes 42 which are bored fromthe inner peripheral wall portion 12 of the mold, along lines that aredisposed in radial planes thereof, and inclined steeply to the innerperipheral plane 32 of the mold, to enter the upper chamber at points inthe upper-half thereof. The passages between the slot 40 and lowerchamber 22 take the form of grooves 44 which are routed from the uppersurface of the cover plate 8, at the tapered edge 38 thereof,andextended sufficient length in radial planes of the plate, to openinto the inner half of the lower chamber at the bottom. The fluid in theborings 42 operates to cool the inner peripheral wall 12 of the mold;whereas the fluid discharged through the grooves 44 impinges on thefluid issuing from the borings, and intermixes with it in the slot 40 toregulate the coolant capacity of the mix before it discharges into theinner peripheral plane 32 of the mold.

The bafi'les 28 and 30 are interposed upright in the chambers 20 and 22to divide each into radially inner and outer subchambers between whichthe fluid undergoes reentrant flow in reaching therespective passages 42and 44. Thus, the baffle 28 in the upper chamber 20 has a series ofapertures 46 in the lower half thereof to require the fluid in the upperchamber to undergo downturned reentrant flow to the borings 42; and thebaffle 30 in the lower chamber 22 has a series of apertures 48 in theupper half thereof to require the fluid in the latter chamber to undergoupturned reentrant flow to the grooves 44. Each baffle is dadoed intothe plate below, and is sealed to the ceiling of its chamber by means ofa channelled and V-grooved elastomeric sealing ring 50 mounted about theupper edge thereof, thus rendering the entire baffle and plate assemblyremovable from the mold for cleaning purposes. Other elastomeric sealingmembers 52 are dadoed into the plate 8 to reseal the assembly in themold when it is returned thereto.

in the modified dual-flow version of FIGS. 9 and 10, the mold 54 issimilar in plan view and profile, but the cavity 56 recessed in theunderside thereof is defined between inner and outer peripheral wallportions 58 and 60 of substantially equal thickness, and there is acorbel 62 jutting into the cavity from the inner peripheral wall portion58 of the mold, at a level above the bottom of the outer peripheral wallportion 60. Also, the cavity 56 is serviced through a plurality ofnipples 64, 66 and 68 which are mounted on the cover plate 70screw-clamped to the underside of the mold. The plate 70 has a miteredinner peripheral edge 72, however, which together with a tapered lip 74depending from the inner peripheral wall portion of the mold, defines anozzled slot 76 in the underside of the mold, as in the earlierdescribed embodiment. Fluid is fed to the slot through one of aplurality of chambers which are formed in the cavity 56 at the insideends of the nipples, as shall be explained.

The inner peripheral edge portion of the cover plate 70 has a steppedbulkhead 78 raised thereon, immediately radially outwardly from themitered edge 72 thereof, and tightly interposed between the uppersurface of the bulkhead and the ceiling of the cavity 56, is a weldedsuperstructure of box partitioning 80 forming a pair of tubular jackets82 and 84 around the perimeter of the mold, the upper 82 of whichjackets is wider than the lower jacket 84 and defined in part by theceiling of the cavity. The step 86 of the bulkhead is tightly clampedagainst the corbel 62 on the inner wall portion of the mold, when thecover plate 70 is added, and the trough-like casing of the upper jacket82 is equipped with a pair of channelled and V-grooved elastomericsealing rings 88, as in the case of the baffles 28 and 30 in the earlierembodiment, to effect a seal against the ceiling of the cavity. Thedisposition of the partitioning 80 divides the cavity 56 into innerperipheral and outer peripheral chambers 90 and 92, respectively, andone body of fluid is circulated to inner peripheral chamber 90, to coolthe inner peripheral wall portion 58 of the mold, whereas another bodyof fluid is circulated to the outer peripheral chamber 92 to service theslot 76, as shall be explained.

The jackets 82 and 84 have series of circumferential openings 94 and 96about the upper and lower halves thereof, respectively, through whichthey communicate with the inner peripheral chamber 90, and fluid iscirculated to the chamber by introducing it into the upper jacket 82through a set of relatively small diameter elbowed nipples 64 passedupwardly through the cover plate 70 and the outer peripheral chamber 92to each corner of the jacket 82. From the upper jacket, the fluid entersthe inner peripheral chamber through the openings 94 and ultimatelydrains into the lower jacket 84 and out of the mold through another setof relatively small diameter elbowed nipples 66 passed downward throughthe outer chamber 92 and the cover plate 70 at points midway along thesides of the mold. Meanwhile, other fluid is fed to the outer peripheralchamber 92 through a set of relatively large diameter nipples 68 whichare flush-mounted in the comers of the plate and from there, the fluidenters the slot 76 through a series of inclined, circumferentiallyoriented borings 98 about the base of the bulkhead 78.

As in the earlier described embodiment, the entire plate andpartitioning assembly is removable for cleaning, there being elastomericsealing members 100 dadoed into the plate for rescaling the assemblywhen it is returned to the mold.

I claim:

1. In combination, an axially upright, monolithic, sleeve-like,open-ended direct chill casting mold provided with an annular recess inand about the lower axial end thereof, so as to have an invertedU-shaped cross section at points about the axis thereof, comprised ofsubstantially axially coextensive inner and outer peripheral wallsjoined across the upper end portions thereof by an annular end wall, theinner peripheral wall of said mold having a dlepending lip on and aboutthe lower end thereof, the inner peripheral surface of which coincideswith the inner peripheral surface plane of said inner peripheral wall;an annular plate secured to the mold on the lower ends of the inner andouter peripheral walls, and extending about the lip so as to cover therecess and form an annular cavity in the mold, but being spaced apartfrom the outer peripheral surface of the lip so as to form an aperturetherebetween; partition means interposed in the cavity between the innerand outer peripheral walls of the mold so as to divide the cavity intotwo separate chambers, one of which is disposed adjacent the annularupper end wall of the mold; means for supplying coolant fluid to eachchamber; means including the inner peripheral wall, defining a passagewhich extends adjacent the inner peripheral surface plane of the innerperipheral wall and interconnects the one chamber with the lower end ofthe inner peripheral wall, to cool the cast by circulating the fluid inthe one chamber into contact with the inner peripheral wall; and meansincluding the plate, defining a passage which extends adjacent the lowerend of the inner peripheral wall and interconnects the other chamberwith the aperture, to further cool the cast by releasing at least thefluid in said other chamber into the aperture, for discharge into theinner peripheral surface plane of the inner peripheral wall at the lipof the mold.

2. The combination according to claim 1, wherein the partition means isdisposed in the cavity so as to form relatively upper and lower chambersadjacent the upper end wall of the mold and the: plate, respectively.

3. The combination according to claim 2, wherein the outer peripheralsurface of the lip terminates in spaced relationship to the lower innerperipheral end edge of the inner peripheral wall, to form a shoulderthereon, and the plate abuts the shoulder and the lower end of the outerperipheral wall, but has grooves therein which together with theshoulder form passages interconnecting the lower chamber with theaperture.

4. The combination according to claim 2, wherein the inner peripheralwall has holes therein forming passages which interconnect the upperchamber with the aperture to release the fluid in the upper chamber intothe same for discharge into the inner peripheral surface plane of theinner peripheral wall.

5. The combination according to claim 2, wherein the partition meanstakes the form of another annular plate which is secured to the mold inthe cavity in spaced, parallel relationship to the first mentionedannular plate.

6. The combination according to claim 2, wherein the fluid is suppliedto the chambers through holes in the outer peripheral wall.

7. The combination according to claim 1, wherein the partition means isdisposed in the cavity so as to form relatively inner and outer chambersadjacent the inner and outer peripheral walls, respectively.

8. The combination according to claim 7, wherein the inner peripheralwall has an annular corbel on and about the inner peripheral surfacethereof adjacent the lip, and the plate abuts the corbel and the lowerend of the outer peripheral wall to close the bottoms of the inner andouter chambers, but the plate has holes therein forming passagesinterconnecting the outer peripheral chamber with the aperture.

9. The combination according to claim 7, wherein the partition means hasrelatively upper and lower chambers formed therein adjacent the upperend wall of the mold and the plate, respectively, and the inner chamberinterconnects with the upper and lower chambers of the partition meansto form a passage which cools the cast by circulating the fluid thereofinto contact with the inner peripheral wall, one of said upper and lowerchambers ha ing an outlet to the exterior of the mold disposed todischarge the fluid therein separately and independently of the aperturebetween the lip and the plate.

10. The combination according to claim 7, wherein the partition means isupstanding on and about the plate, and is interconnected with the plateas a composite assembly which is conjointly attachable and detachable toand from the mold.

11. The combination according to claim 7, wherein the fluid is suppliedto the chambers through holes in the plate.

12. The combination according to claim 1, wherein the aperture takes theform of an annular slot extending between the plate and the lip aboutthe perimeter of the mold.

13. In a sleeve-like, open-ended direct chill casting mold, meansincluding one end wall portion of the mold, defining a fluid coolantchamber around the inner peripheral wall of the mold, and an aperture inthe body of the mold, about the opening in the one end thereof, adjacentthe inner peripheral wall of the mold; means for supplying fluid coolantto the aperture for discharge into the inner peripheral plane of themold, including a fluid coolant inlet which is connected to the apertureseparately and independently of the chamber, through a second chamberwhich is separated from the inner peripheral wall of the mold by thefirst mentioned chamber, and interconnected with the aperture by aseries of passages extending within the one end wall portion of themold; and passage means in the body of the mold, connecting the firstmentioned chamber to an outlet which is separate and independent of theaperture, to discharge the coolant in the first mentioned chambertherethrough, including a system of box partitioning which is interposedbetween the first and second mentioned chambers, and operative to form apair of tubular jackets therebetween which communicate with the firstmentioned chamber, to supply and withdraw fluid coolant therefrom.

14. The mold according to claim 13 wherein the passage means alsoinclude a plurality of nipples which are interconnected with the jacketsto supply and return the coolant through the one end wall portion of themold.

15. The mold according to claim 14 wherein there is a cavity in the oneend of the mold, the opening of which is closed by a removable coverthat is equipped with the partitioning and nipples, to form a cellularinfrastructure which defines the jackets and inserts in the cavity toseparate the first and second mentioned chambers from one another.

16. The mold according to claim 15 wherein the cover has a bulkheadraised thereon, about the inner peripheral edge thereof, and thepassages to the aperture from the second mentioned chamber are disposedin the bulkhead.

17. The mold according to claim 13 wherein the aperture takes the formof an annular slot of nozzled cross section in the one end of the mold.

1. In combination, an axially upright, monolithic, sleeve-like,open-ended direct chill casting mold provided with an annular recess inand about the lower axial end thereof, so as to have an invertedU-shaped cross section at points about the axis thereof, comprised ofsubstantially axially coextensive inner and outer peripheral wallsjoined across the upper end portions thereof by an annular end wall, theinner peripheral wall of said mold having a depending lip on and aboutthe lower end thereof, the inner peripheral surface of which coincideswith the inner peripheral surface plane of said inner peripheral wall;an annular plate secured to the mold on the lower ends of the inner andouter peripheral walls, and extending about the lip so as to cover therecess and form an annular cavity in the mold, but being spaced apartfrom the outer peripheral surface of the lip so as to form an aperturetherebetween; partition means interposed in the cavity between the innerand outer peripheral walls of the mold so as to divide the cavity intotwo separate chambers, one of which is disposed adjacent the annularupper end wall of the mold; means for supplying coolant fluid to eachchamber; means including the inner peripheral wall, defining a passagewhich extends adjacent the inner peripheral surface plane of the innerperipheral wall and interconnects the one chamber with the lower end ofthe inner peripheral wall, to cool the cast by circulating the fluid inthe one chamber into contact with the inner peripheral wall; and meansincluding the plate, defining a passage which extends adjacent the lowerend of the inner peripheral wall and interconnects the other chamberwith the aperture, to further cool the cast by releasing at leasT thefluid in said other chamber into the aperture, for discharge into theinner peripheral surface plane of the inner peripheral wall at the lipof the mold.
 2. The combination according to claim 1, wherein thepartition means is disposed in the cavity so as to form relatively upperand lower chambers adjacent the upper end wall of the mold and theplate, respectively.
 3. The combination according to claim 2, whereinthe outer peripheral surface of the lip terminates in spacedrelationship to the lower inner peripheral end edge of the innerperipheral wall, to form a shoulder thereon, and the plate abuts theshoulder and the lower end of the outer peripheral wall, but has groovestherein which together with the shoulder form passages interconnectingthe lower chamber with the aperture.
 4. The combination according toclaim 2, wherein the inner peripheral wall has holes therein formingpassages which interconnect the upper chamber with the aperture torelease the fluid in the upper chamber into the same for discharge intothe inner peripheral surface plane of the inner peripheral wall.
 5. Thecombination according to claim 2, wherein the partition means takes theform of another annular plate which is secured to the mold in the cavityin spaced, parallel relationship to the first mentioned annular plate.6. The combination according to claim 2, wherein the fluid is suppliedto the chambers through holes in the outer peripheral wall.
 7. Thecombination according to claim 1, wherein the partition means isdisposed in the cavity so as to form relatively inner and outer chambersadjacent the inner and outer peripheral walls, respectively.
 8. Thecombination according to claim 7, wherein the inner peripheral wall hasan annular corbel on and about the inner peripheral surface thereofadjacent the lip, and the plate abuts the corbel and the lower end ofthe outer peripheral wall to close the bottoms of the inner and outerchambers, but the plate has holes therein forming passagesinterconnecting the outer peripheral chamber with the aperture.
 9. Thecombination according to claim 7, wherein the partition means hasrelatively upper and lower chambers formed therein adjacent the upperend wall of the mold and the plate, respectively, and the inner chamberinterconnects with the upper and lower chambers of the partition meansto form a passage which cools the cast by circulating the fluid thereofinto contact with the inner peripheral wall, one of said upper and lowerchambers having an outlet to the exterior of the mold disposed todischarge the fluid therein separately and independently of the aperturebetween the lip and the plate.
 10. The combination according to claim 7,wherein the partition means is upstanding on and about the plate, and isinterconnected with the plate as a composite assembly which isconjointly attachable and detachable to and from the mold.
 11. Thecombination according to claim 7, wherein the fluid is supplied to thechambers through holes in the plate.
 12. The combination according toclaim 1, wherein the aperture takes the form of an annular slotextending between the plate and the lip about the perimeter of the mold.13. In a sleeve-like, open-ended direct chill casting mold, meansincluding one end wall portion of the mold, defining a fluid coolantchamber around the inner peripheral wall of the mold, and an aperture inthe body of the mold, about the opening in the one end thereof, adjacentthe inner peripheral wall of the mold; means for supplying fluid coolantto the aperture for discharge into the inner peripheral plane of themold, including a fluid coolant inlet which is connected to the apertureseparately and independently of the chamber, through a second chamberwhich is separated from the inner peripheral wall of the mold by thefirst mentioned chamber, and interconnected with the aperture by aseries of passages extending within the one end wall portion of themold; and passage means in the body of the moLd, connecting the firstmentioned chamber to an outlet which is separate and independent of theaperture, to discharge the coolant in the first mentioned chambertherethrough, including a system of box partitioning which is interposedbetween the first and second mentioned chambers, and operative to form apair of tubular jackets therebetween which communicate with the firstmentioned chamber, to supply and withdraw fluid coolant therefrom. 14.The mold according to claim 13 wherein the passage means also include aplurality of nipples which are interconnected with the jackets to supplyand return the coolant through the one end wall portion of the mold. 15.The mold according to claim 14 wherein there is a cavity in the one endof the mold, the opening of which is closed by a removable cover that isequipped with the partitioning and nipples, to form a cellularinfrastructure which defines the jackets and inserts in the cavity toseparate the first and second mentioned chambers from one another. 16.The mold according to claim 15 wherein the cover has a bulkhead raisedthereon, about the inner peripheral edge thereof, and the passages tothe aperture from the second mentioned chamber are disposed in thebulkhead.
 17. The mold according to claim 13 wherein the aperture takesthe form of an annular slot of nozzled cross section in the one end ofthe mold.